Method for detecting displacement of non-contact moving target

Abstract

The invention provides a method for detecting displacement of a non-contact moving target. The displacement is detected by using cross correlation characteristic of a two-value random coding image target and a random matrix. The target which is fixedly connected with an object to be tested and moves along with the object is printed with the two-value random coding image; and a coding value of the coding image corresponds to a two-value random matrix (a target matrix). A target region is photographed at different moments at a fixed optical axis and a fixed visual angle; and a local image of the target obtained each time is decoded to form a sub-matrix (a detection matrix) of the target matrix. Offset of a peak value of a cross correlation function of the detection matrix and the target matrix at different moments is proportional to displacement distance of the object to be tested, so the detection is realized according to the relation. According to characteristics of the cross correlation function of the random matrix, the method has high detection accuracy, high anti-interference capacity and low requirement on image quality and is suitable for long-term on-line automatic detection at different observation distances.

Description

technical field [0001] The invention relates to a method for detecting the displacement of a non-contact moving object, in particular to a method for detecting the displacement of a non-contact moving object by using an image processing method. Background technique [0002] In the monitoring of the safety status of large building structures such as bridges, buildings, and dams, and the monitoring of natural disasters such as landslides and ground subsidence, it is necessary to perform long-term, continuous detection and recording of the displacement of certain specific points on the target. The displacement detection technology and equipment used in this occasion must have the characteristics of long-distance and non-contact. There are three types of detection methods currently available for the above occasions: [0003] (1) The laser total station has high measurement accuracy, but the equipment is expensive, has high requirements for the working environment and installati...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem that the detection result of the existing displacement detection method using image processing is greatly affected by environmental conditions and has low reliability, the present invention proposes a non-contact moving target displacement detection method, the purpose of which is to improve the anti-environmental interference of the image processing displacement detection method ability to improve detection accuracy and reliability

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